Re: IPv6 multihoming

[Brian E Carpenter <brian.e.carpenter@gmail.com>]

On 2010-01-26 04:54, Andy Davidson wrote:
> On 25/01/2010 08:55, Vlad Ion wrote:
>> I propose that the 6to4 ip conversion space from ipv4 addresses to
>> 2002::ipv6 space will be redefined as provider independent address
>> space. This way whoever wants to implement ipv6 with multi-homing can
>> simply redefine their existing IPv4 addresses in IPv6 6to4 format and
>> have multi-homing in ipv6.
> 
> Sorry, this scares me.

Well yes. Let's try a thought experiment that doesn't break 6to4:

Proclaim that everyone who has a valid global IPv4 prefix owns
the PI IPv6 prefix 4444:V4ADDR::/48.

Then we have automatically imported all 318333 IPv4 prefixes
(according to routeviews) into IPv6.

I'm not quite sure how this would provide multihoming.

    Brian


> It is not difficult to get IPv6 PI from the RIRs I have experience with.
> 
> For example, in Europe, obtaining a single /48 IPv6 PI is a quick
> process.  Obtaining it in this way means that unused v4 is not recycled
> as spoofable v6, and that organisations with tens of v4 unjoined
> prefixes need not announced tens of unjoined v6 prefixes when they migrate.
> 
> I commend you for thinking about ways to encourage networks to adopt v6,
> but I think that education and advocacy is more future-proof than
> migrating the v4 swap to v6.
> 
> Andy
> 
>